Demonstration
Part of speech: noun
Definition: The act of demonstrating; showing or explaining something. An event at which something will be demonstrated. A public display of group opinion. A show of military force. A mathematical proof.
Example sentence: Post-operatively the transplanted kidney functioned immediately with a dramatic improvement in the patient's renal and cardiopulmonary status. This spectacular success was a clear demonstration that organ transplantation could be life-saving.
Presentment
Part of speech: noun
Definition: A statement made on oath by a jury.A formal complaint submitted to a bishop or archdeacon.The act of presenting something for acceptance; now specifically, presenting something (eg a bill or cheque) for payment.An artistic representation; a picture.Presentation of a performance, as of a play or work of music.The aspect or form in which something presents itself; appearance.